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your case is complicated in such way, as you have anal fissure
, acidity, constipation
and low back pain
you do not solve all three problem together, So you should have to go step by step.
Now you should have to avoid treatment for low back pain, you can get relief from electric heating pad
at the time of pain
now start these medicines for solve other problems;
1. Dindayal churna 1 spoon at night with water
2. Acitra Syrup 5 ml thrice a day
3. Amlapittahar tab 2 tabs twice a day
4. Praval Panchamrut tab 1 tab twice a day (mukta yukta)
5. Avipattiakr churna 1 gram after meal - twice a day
6. Chandrakala ras 2 tabs thrice a day
after three moths of these medication you have to change the medicine for low back pain and you will get cured out approximate in one years !!